Hydraulic forging press: Hydraulic forging press is a type of forging machine in which the forging action is carried out by means of hydraulic system where ram moves up and down in a cylinder by hydraulic pressure.
In hydraulic forging press, the ram moves downward along with a die due to the high amount of hydraulic pressure applied on the ram.
During this working stroke, the metal piece is forged between the upper die and lower die. After this, the ram again moves in upward direction by means of hydraulic pressure only.
Schematic diagram of the hydraulic forging press is shown in above image.
Hydraulic forging is a slow forging process because the time required for each stroke is more as compared to that of drop forging process.
Also due to the contact time of the die with the workpiece is more. This results in a loss of heat from the workpiece. This is because the metallic dies are more conductive as compared to the surrounding atmosphere.
Loss of heat from the workpiece even caused cracks to the workpiece as well as the dies also damages due to higher temperature.
Hydraulic forging presses are comparatively more expensive than mechanical forging presses.
Advantages of hydraulic forging press
Advantages of hydraulic press forging are mentioned below.
- Hydraulic forging press is more advantageous for forging metals that have lower temperatures.
- Hydraulic forging press has higher capacity to forge the metal as compared to steam hammer forging.
- The dimensional accuracy achieved by hydraulic press forging is high.
- Hydraulic forging press is suitable for extrusion type forging operations.
Disadvantages of hydraulic forging press
Disadvantages of hydraulic press forging are mentioned below.
- The cost of hydraulic forging press is higher than that of the mechanical forging press (of equal capacity).
- Time required for hydraulic forging process is more, as the operation is slow.
- Heat loss takes place from the workpiece because the dies remain in contact with the workpiece for a longer time.